In
XVIth century, American cities experienced a golden age, because of
the increasing population in relation to their functions. American
cities were planned following some elaborate schemes from the grid,
but in many cases, did not maintain such planning, and others were
growing around their roads. Measures to healthy city and its
supply, by building fountains and aqueducts linked. The cobbled
streets and its lighting, water supply, etc. From the eighteenth
century were embellished, because infrastructure is built according
to the new taste, to taste illustrated walks arise.

The malls have become a resource intended for beautification of these walks, at the same time will become witnesses of celebrations, processions and place of recreation for American society. The streets are decorated right now for different celebrations that take place in them, are processions backdrop, beatification, theaters or bullfights.

Into
the twentieth century, such as occurred in Nazi Germany or
Mussolini's Italy were conducted monumental architecture, wide
avenues for their mass ceremonies for the greater glory of the regime
and its dictator, situation we must also move to America.

Today,
due to the massive growth of cities both in terms of population
refers to as its extension, in many cases it has lost the regularity
of apples in them were drawn, especially in certain areas of the
city, especially in the slums. Another factor it is pollution from
factories in urban centers and the traffic thatn affect adversely the
buildings which has been reflected in structural problems.

The
slum areas are one of the objectives of current American policies,
social and urban. These neighborhoods need specific policies as they
are usually troubled areas both by the lack of economic and social
resources of the people and for the development of their housing
problems. In many cases, these people from rural areas without means
and tend to work in jobs not very pleasant, occupying vacant land on
the outskirts of the cities or in the center and develop a popular
urban short-lived materials and conditions in many cases, inhumane,
lacking lighting or pavement, water and electricity, where several
families live. They tend to collect high rates of mortality, social
tensions and crime or insufficient education which are helped by the
various NGOs or even neighborhood cooperatives. This contrasts
with the construction around major metropolitan areas such as
residential areas or the real estate boom of the Riviera Maya,
Quintana Roo, Yucatan, negatively affecting to the environment but a
great economic benefit.